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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Daniel Drake <dsd@gentoo.org>,
        Johan Hovold <johan@kernel.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 048/241] zd1211rw: fix NULL-deref at probe
Date:   Mon, 19 Mar 2018 19:05:13 +0100
Message-Id: <20180319180753.190838192@linuxfoundation.org>
In-Reply-To: <20180319180751.172155436@linuxfoundation.org>
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Precedence: bulk

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@kernel.org>


[ Upstream commit ca260ece6a57dc7d751e0685f51fa2c55d851873 ]

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

Fixes: a1030e92c150 ("[PATCH] zd1211rw: Convert installer CDROM device into WLAN device")
Cc: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/zydas/zd1211rw/zd_usb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
@@ -1278,6 +1278,9 @@ static int eject_installer(struct usb_in
 	u8 bulk_out_ep;
 	int r;
 
+	if (iface_desc->desc.bNumEndpoints < 2)
+		return -ENODEV;
+
 	/* Find bulk out endpoint */
 	for (r = 1; r >= 0; r--) {
 		endpoint = &iface_desc->endpoint[r].desc;